Thomas a



(No Model.)

T. A. EDISON.

INOANDESGING ELECTRIC LAMP.

N 273,485. Patented Mar. 6, 1883.

ATTEST: INVENTOR:

Nrrnn ira'ras THOMAS A. EDISON, OE MENLO PARK, NEW JERSEY.

INCANDESCING ELECTRIC LAMP. v

SPECIFICATION forming part of Letters Patent No. 273,485, dated March 6, 1883,

Application filed November 9, 1882. (No model.)

- is a specification.

In the use of iucandescing electric lamps it may sometimes be desired that the lightgiving body shall be of a broad, flat shape similar to that of a gas-flame. My object is to provide a lamp of this character.

In the lamp which I have devised the incandescing conductor consists of two flexible horseshoe-shaped filaments of carbon, connected together within the globe in series, and diverging or spreading out from each other, so that the effect of a broad, fiat flame is produced, the conductor being supported in the middle from the glass inner stem of the lamp. Such filaments are attached to the inner stem by means ot' the leading-in wires and a 'central wire-support sealed therein, and are placed in the lamp together, they being first folded orbenttogether, so that they may pass through the opening at the bottom of the globe. The stem is sealed, as usual, in the bottom of the globe. The topof the globe is provided with an opening of sufficient size to admit a suitplaced in position an exhaust-tube is sealed to the top of the globe, through which the air is exhausted, the carbon being heated to incandescence during the exhausting process, and the exhaust-tube is then sealed off closeto the top of the globe.

By the use of the devices and process described I produce a lamp of very high resistance, and of an ornamental and desirable construction.

My invention is illustrated in the annexed drawing, which is a view in elevation ofa lamp embodying said invention.

A is the inclosing-globe, and B the inner glass stem or wire-support through which the leading-in wires] 2 pass. Such stem is sealed in the bottom of the globe at a a. The globe is provided with a projection, G, at its top, which originally is left open.

D D are the two carbon filaments, electroplated or otherwise attached together at I), and to a supportin gwire sealed into the stem, and attached to the leading-in wires 1 2 at c 0, so thattheyare conuectedin series. The filaments are folded together, so thatthey may be passed through the opening a a, and after the stem B is sealed within-said opening a tool is introduced through 0, and the filament bent apart, as shown. The globe is exhausted through a tube attached at G, and such tube the wire-support B, the diverging filamentsl) D, the leading-in wires, and the central wiresupport, substantially as set forth.

This specification signed and witnessed this 26th day of October, 1882.

i THOS. A. EDISON.

Witnesses:

WM. H. MEADowoRoFT, H. W. SEELY. 

